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While randomly browsing some LEGO sites, I came across a weird (to me anyway) looking bushing. Its part 4265c. Below is one of the images describing it and the left one I recognize, but the right one I have never seen. It looks like there is some built-in play to the axis.

So my questions:

  1. Are the two bushings on the image interchangeable?
  2. Are they both really referred to by the same id (4265c)?
  3. Is there any practical difference between the two?
  4. Are there any specific use cases where the second would be preferred over the first one?

Bushing 4265c

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They both appear to have the same part ID despite being quite different.

Sariel answers most of your questions in The Unofficial LEGO Technic Builder's Guide.

toothed half bush with a cutout

The second variant, the toothed half bush with a cutout, is exactly what its name implies: a copy of the previous version with part of the axle hole cut out, which makes the axle hole large (see Figure 4-13).

This modification was introduced to make it easier for children to take half bushes on and off the axles, and that's exactly what makes it much less popular with builders: These bushes are more likely to shift when stressed than the first variant.

Other than that, it has every quality of the original toothed half bush except that, having been introduced a few years later, it's newer and thus made of strong material.

(Chapter 4. Page 36.)

Pawel "Sariel" Kmiec, 2012. The Unofficial LEGO Technic Builder's Guide. 1 Edition. No Starch Press.

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Interesting... brickowl lists the right picture for 4265c while peeron lists the left picture.

This leads me to think that both are interchangeable and that the one in the right picture is a more cost-efficient version of 4265c (using slightly less ABS). Lego Pick-a-Brick also shows the version in the picture on the right.

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